cathcam wrote: > Today is squeeebox fix day, started with wlanpoke on a radio which seems > to be working, on to the controller. > > I have two Duets, like many, I bought a spare from ebay. > > I have the same problem as everyone. Tried the backup controller(which > has the original Logitech battery) in to the primary cradle, same > problem. Tried the backup cradle and seems to be charging, booted fine! > > So I have to fix the backup cradle. As a life long software guy, I have > a "I don't understand question" aka dumb question. > > The Controller cradle power supply can be plugged in either way up in a > US 110v power socket, effectively reversing the polarity. Q. Why does > the polarity in the wires matter?
Hi, because at the wall p!ug the power is AC, single phase, voltages swings from negative to positive. The power supply (the block) rectified the voltage to all positive, then filters the voltage "humps" to create a dc voltage with as little of ripple (smoothed humps) as possible. The resultant dc has a polarity, where the incoming ac does not. Your sb is looking for a +Vcc and a Vdd (ground). This is why the polarity matters Ho ho ho... Jim ------------------------------------------------------------------------ Redrum's Profile: http://forums.slimdevices.com/member.php?userid=33806 View this thread: http://forums.slimdevices.com/showthread.php?t=107328 _______________________________________________ Duet mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/duet
